Initiative tracker isn't able to pull stats from creatures defined using 'extends'

[Jnosh]

I was playing around with the extends functionality from the statblock plugin and noticed that initiative tracker only seems to use the data defined in the new statblock, i.e. it doesn't seem to merge in the data from the base creature being extended when used in this plugin.

This is easily noticeable when hovering over a creature in an encounter block, normally it displays the AC and HP but doesn't if the extending statblock doesn't override the ac or hp fields. Similarly, in the initiative tracker no HP or AC are displayed.

No AC, HP available in encounter blocks on hover or in initiative tracker:

```statblock
extends: Goblin Warrior
name: Test Creature
```

If the AC, HP are explicitly listed in the extending statblock, they are picked up as usual:

```statblock
extends: Goblin Warrior
name: Test Creature
hp: 50
ac: 18
```

[stale]

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